An unplanned maintenance stop on one out of two primary mills has occurred as a result of damage between the trunnion and feed end. Production in the affected mill line has been stopped and is expected to restart in December.

In addition, seasonal and unfavorable weather conditions in mid-November have resulted in elevated nitrogen dioxide levels in the air in Aitik. This led to restrictions on large parts of Aitik's industrial area and production was limited.

All in all, this means that Aitik's throughput during the fourth quarter of 2023 is now estimated to amount to just over 9 Mton, compared to just over 11 Mton that can be expected under more normal conditions. Guidance for copper and gold content is not affected by the above production disruptions.

For further information, please contact:

Klas Nilsson, Director Group Communications, phone: +46 70-453 65 88

klas.nilsson@boliden.com 

This information is information that Boliden AB is obliged to make public pursuant to the EU Market Abuse Regulation. The information was submitted for publication, through the agency of Director Investor Relations, at 08.00 CET on November 29, 2023.

Boliden's vision is to be the most climate-friendly and respected metal provider in the world. We are Europe's producer of sustainable metals and, guided by our values care, courage and responsibility, we operate within exploration, mines, smelters and recycling. We are more than 6,000 employees and have annual revenues of approximately SEK 85 billion. The share is listed in the Large Cap segment of NASDAQ OMX Stockholm.